Chromable azo dyestuffs



Patented Mar. 6, 1951 UNITED STATES PATENT OFFICE CHROMABLE Aizoh riis'irUFF's Aoh ille 'oon'zettiana Guido Schetty, Basel, Switzerland, assignors to J. R. Geigy A.-'G., Basel, Switzerland, a Swiss firm No Drawing, Application December 19, 1945, se-

rial No. 636,062. In Switzerland December 21,

wherein X means hydrogen or a phenyl radical, which can be substituted, and treating the soobtained azo dyestuffs, which correspond 'to the formula on son;

wherein AN=N'- represents the radical of a diazotised amine of the benzene or naphthalene series which contains a lake-forming group, preferably in o-position to the amino-group, and X stands for hydrogen or a radical of the benzene series, on the fibre or in substance with chromeyielding agents.

By the term aromatic amines containing lakeforming groups and possibly also azo groups may be understood compounds which contain a hydroxyl, a carboxyl, or an alkoxy group in o-position to the amino group or which contain the salicylic acid grouping. Thus may be enumerated, by way of example only: o-aminophe'nols, o-aminonaphthols, o-aminobenzene carboxylic acids, o-aminonaphthalene carboxylic acids, 0-

amino alkoxybenzenes, such as o-aminomethoxye, -ethoxyor propyloxybenzenes and so on. These compounds may be further substituted in any way, for instance by alkyl, nitro, sulfonic acid groups or by halogen.

The coupling components corresponding to the above formula are made according to'U. S- patent application Ser. No. 634,151 filed on De'cember 10, 1945, now U. S. Pat. No. 2,451,579.

8 Claims. (01.

The production of the chrome complex compounds can be carried out according to known methods, such as for instance by heating the dyestufis with chrome-yielding agents, e. 9;. also with salicylic acid chromium complex compoundsi'n a neutral, acid or alkalin medium, but also in organic solvents, in organic bases, in carboxylic acid amides or corresponding ammonium salts; it is also possible to work with a reduced pressure. The chromation on the fibre may also be carried out according to known methods, "for example according to the one-bath chromi-ng method, by an after-chroming method, etc.

The dyeings obtainable. with the chromed dyestuffs of the present invention as well as the dye- Example 1 20.8 parts of 4-chloro-l-aminobenzene-3-sulfonic acid are 'diazotised and coupled in a slightly acid medium with I2.3'parts of 4-methyl-2- amino-l-hydroxybenzene in the presence of sodium thiosulfate and sodium acetate. This monoazo dyestufl is diazotised in the usual manner, the isolated diazo compound is stirred in 200 parts of water and thegobtained suspension is poured into a solution of 26 parts of l-methyl-lhydroxynaphthalene-S-sulfonic acid in 300 parts of water, 30 parts of anhydrous sodium carbonate and 30 parts of pyridine. After completion of the dyestuii formation, the whole is heated to C. and the dyestuff precipitated in a crystalline form after addition of sodium chloride is filtered by suction and dried. The new dyestufi, a blue black powder which corresponds to the formula SOaH a dyes wool from an acid bath in violet shades which are converted into clear green shades of very good appearance in artificial light after the after-chroming. The dyeings are very fast to milling and to light and possess an evenness remarkable for a disazo dyestuff.

Example 2 OH SOaH formation the mixture is neutralised with hydrochloric acid, the dyestuff filtered, suspended in 1000 parts of hot water, treated with 200 parts of a chromium sulfate solution corresponding to 10 parts of chromium sesquioxide and heated for 24 hours to boiling. First a clear, green blue solution is formed, from which the chrome complex dyestuff begins to separate in a crystalline form. The latter is filtered off after cooling and dried. Thus a bronzy powder is obtained which dyes wool from a sulfuric acid bath in clear, bluish green shades. The dyeings are distinguished by an excellent color in artificial light and by a very good evenness.

Example 3 10.9 parts of 2-amino-1-hydroxybenzene are diazotised and the solution of the diazo compound is poured into a solution of 27.3 parts of sodium 4 methyl-1-hydroXynaphthalene-8-sulfonate in 300 parts of water, 10 parts of anhydrous sodium carbon-ate and 40 parts of pyridine. The whole is heated to 35 C. and stirred until the diazo compound has disappeared. The formed dyestuff of the formula on on so r;

crystallizes in aggregates of golden-chafer brilliancy. The same is filtered off still warm, then it is suspended in 1500 parts of water and, after addition of a solution of ammonium-chromiumsalicylate corresponding to 9.1 parts of chromium sesquioxide, heated to boiling for 20 hours. The chrome containing dyestufi crystallizes partly already in the heat. Its precipitation is completed by addition of sodium chloride, then it is filtered and dried. The new dyestuff, a violet powder, dyes wool from a formic acid bath in very even, violet shades.

Example 4 13.7 parts of 2-aminobenzoic acid are diazotised and the acidity of the obtained diazo solution decreased to Congo violet reaction, by means of sodium bicarbonate. At -5 0. the diazo compound is allowed to run into a solution of 26 parts of -methyl-1-hydroxynaphthalene-8-sulfonic acid in 500 parts of water and parts of anhydrous sodium carbonate. After a few hours the dyestufi formation is complete. The precipitated dyestuif of the formula 00 OH OH 80311 is filtered ofi, dissolved in 800 parts of water and, after addition of 240 parts of a solution of ammonium-chromium-salicylate corresponding to 9.1 parts of Cr203, heated to boiling for several hours. The violet solution thus formed is filtered still hot in order to remove any insoluble crystalline precipitate, whereupon the filtrate is salted out by means of 270 parts of sodium chloride; then the dyestufi precipitated in a powdery form is filtered on? and dried. The new chrome-containing dyestuff, a violet powder, dyes wool from a formic acid bath in very clear, violet shades. The dyeings are distinguished by an excellent evenness.

Example 5 dyes Wool from an acid bath in bluish-red shades. When after-chromed these dyeings are convered into very clear, blue green shades of very good shade in artificial light. Besides the so-obtained dyeings are distinguished by good fastness properties in the moist state and by a good light-fastness.

Somewhat greener dyestuffs are obtained by using 4-(4'-methoxy) -benzyl 1 hydroxynaphthalene-8-sulfonic acid instead of 4-benzyl-l-hydroxynaphthalene-8-sulfonic acid.

Example 6 16.8 parts of 6-nitro-2-amino-4-methyl-l-hydroxybenzene are diazotised, the acidity being decreased to Congo violet reaction by means of sodium bicarbonate. The diazo compound is poured into a solution of 27.3 parts of the sodium salt of 4-methyl-1-hydroxynaphthalene-8-sulfonic acid in 400 parts of water, 10 parts of anhydrous sodium carbonate and 26 parts of pyridine. After a few hours the dyestufi formation is complete. Then there is heated to.60.".C., the beautifully crystalline dyestufi of the formula ITTO: OH 4 OH SIOaH is filtered 01f still hot, stirred in 1000 parts of water, treated with 240 parts of a solution of ammonium-chromium-salicylate corresponding to 9.1 parts of chrome oxide, andthenv heated for 25 hours to boiling. Now, 40 parts of sodium chloride are added, the chrome complex compound is filtered still hot and dried. Thus a grey black powder is obtained which dyes wool from a formic acid bath in clear, greenish grey shades of excellent evenness. The dyeings possess an excellent shade in artificial light.

Example 7 The suspension of the diazo compound obtained from 15.4 parts of 5-nitro-2-amino-l-hydroxybenzene and broughtto Congo violet reaction by addition of sodium bicarbonate is poured into a solution of 39.4 parts of 4-(4'-hydroxy-3-carboxy) -benzy1 1-hydroXynaphthalene-8-sulfonic acid, 16 parts of anhydrous sodium carbonate in 100 parts of water and 10 parts of pyridine. After completion of the dyestuff formation acetic acid is added until acid reaction to litmus has been reached. Then 20 parts of sodium chloride are added, the separated dyestuff filtered 01f, pur ified by dissolving it in Water and reprecipitating by means of sodium chloride. Thus a dyestuff which corresponds to the formula (I)H OH 80 11 COOH is obtained which dyes wool according to the after-chroming method in blue green shades of very good fastness properties to milling, potting alkali and to light. The dyeings possess an excellent shade in artificial light.

Example 8 14.4 parts of 4-chloro-2 amino-l-hydroxybenzene are diazotised in the usual manner and then combined in a soda alkaline solution with 27.3 parts of the sodium salt of 4methyl1-hydroxynaphthalene-8-sulfonic acid. After completion of the dyestuff of the formula OH S0 13 formation the 2.20 dyestufl is isolated, .heatedin water with an alkali chromite solution from 100 parts ofchromium hydroxide paste (correspond- 1-hydroxynaphthalene-8-sulfonic acid. The isolated dyestuff of the formula 00Ha on SOsH is dissolved in 800 parts of hot water, then a paste 'of freshly precipitated chromium hydroxide corresponding to 10 parts of chromium sesqui-oxide is added to this solution, whereupon 25 parts of formic acid are added, the whole being then heated inv the autoclave for 8 hours to C. The Whole is made slightly alkaline by addition of sodium carbonate. Then any chromium residues are filteredofi and the chrome containing dyestufi is precipitated from the filtrate by means of sodium chloride. The new dyestuff dyes wool from a formic acid bath in violet blue shades.

Example 10 The dyestufi obtainable by coupling 14.4 parts of 4-chloro-2-amino-l-hydroxybenzene with 35 parts of 4-(4'-hydroxy) -benzyl-1-hydr0xynaph,- thalene-8-sulfonic acid in a soda alkaline medium, and corresponding to the formula ?H OH S0311 is suspended in 1500 parts of water, treated with a solution of ammonium-chromium-salicylate (corresponding to 9.1 parts of chromium sesquioxide) and heated to boiling for 22 hours, Whereupon the chrome complex dyestuff is precipitated by addition of parts of sodium chloride, filtered off and dried. Thus a blue violet powder dyeing wool from a formic acid bath in flowery, navy blue shades of a, good light-fastness is obtained.

Example 11 15.4 parts of 4-nitro-2-amino-1-hydroxybenzene are diazotised, the excess of acid is removed by addition of sodium bicarbonate until a neutral reaction is reached and then the whole is poured into a solution of 28 parts of sodium 4-methyl-1-hydroxynaphthalene-8-sulfonic acid in 500 parts of water, parts of anhydrous sodium carbonate and 30 parts of pyridine. There is then stirred at room temperature until the dyestuff formation has completed; then the mixture is heated to 70 0, treated with sodium chloride until complete precipitation of the dyestuff has been reached and filtered off. The dyestuff of the formula is stirred in 1500 parts of water, treated with a solution of ammonium chromium salicylate (corresponding to 9.9 parts of chromium sesquioxide) and heated to boiling for hours. A dark violet solution is formed, from which the chrome-containing dyestuff is separated in a finely crystalline form on addition of sodium 5 boiling temperature.

8 is dissolved in 1500 parts of hot boiling water, treated with a solution of ammonium-chromiumsalicylate (corresponding to 9.9 parts of chromium sesquioxide) and stirred for hours at The chrome containing dyestuff is isolated by addition of sodium chloride. After drying it is a dark violet powder dyeing wool from a formic acid bath in very even, flowery, blue green shades of excellent appear- 10 ance in artificial light.

When in the above example the 5-nitro-2- amino-4-methy1-1-hydroxybenzene is replaced by 5-nitro-2-amino-1-hydroxybenzene, a dyestufl' corresponding to the formula OH 801E OzN N=N is obtained which produces somewhat greener and purer shades.

In the following table further examples will be enumerated.

Table No. Diazo component Shade of the after-chromed Coupling component dyeing on wool 4-nitro-2-amino-l-hydroxybenzene 4-chlor-5-nitro-2-arnino-l-hydroxybenzen picram ie acid 6-methyl-4-nitro-2-amino-l-hydroxybenzen 4-chlor-2-amino-l-hydroxybenzene-6-sulfonic 6-acetylamino-initro-Z-amin0-1-l1ydroxybenzene 6-chlor-4-nitro-2-amino-1-hydroxybenzene 4-methyl-2-amino-1-hydroxybenzene blue.

olive grey. green blue. green.

olive green. greenish blue. dull grey. olive green. violet.

4-amyl-6-nitro-2-amino-1-hydroxybenzene 4-methy1-3:adichlor-2-ammo-1-hydroxybenzen 4:5-dichlov2-amino-1-hydroxybenzene 4:ddichlor-i ramino-l-hydroxybenzene (rnitro-2-amino-l-hydroxybenzenei-sulfonic acid 4-nitro-2-amino-l-hydroxybenzene-(i-sulfonic acid 2-amino-1-hydroxybenzene-i-sulfanilide-2-carboxylie acid 2-amino-l-hydroxybenzenei-sulfonic acid 2-amino-l-hydroxybenzene-4-phenylsulione-(i-sulionic acid... 2-amino-l-hydroxybenzene-4-sul1'amide 2-aminc-l-hydroxybenzene-i-carboxylic acid 2-amino-l-hydroxybcnzene-4-sulfethylanilide-4-sulfonic acid... 4-011lor0-2-an1ino-1-hydroxybenzene-5-sulionic acid 4-Inethyl-2-amino-l-hydroxybenzene-6-sulfonic acid 5-nitro-2-amino-l-hydroxybenzene-i-sulionic acid. 2-amino-l-hydroxybenzene-5-sulfonic acid 3:4-dichlor-Z-arnino-l-hydroxybenzene-6-sulfonic acid l-amino-4-hydroxybenzene-El-carboxylic acid 2-amino-l-hydroxybenzenei-phenylketone cnrboxylic acid 3z i-dichloro-5-nitro-2-amino-1-hydroxybenzene-S-sulfonio acid. 5-chloro-2-an1ino-l-hydroxybenzene-i-sulfonic acid 4-amyl-2-amino-l-hydroxybenzene-fi-sullonic acid.

3:4:G-trichloro-Z-smino-l-hydroxybenzene reddish blue.

olive green. green. greenish grey. violet. grey.

lue violet. violet. reddish grey. reddish blue.

grey. dull blue green. violet.

grey. brown red. violet. violet grey. Do. blue violet.

greenish grey. navy blue.

chloride.

The so-obtained dyestuff dyes wool from a formic acid bath in neutral grey shades of very good evenness.

Example 12 What we claim is: 1. The complex chromium compound of an azo dyestuff corresponding to the general formula OH SOaH 16.8 parts of 5-nitro-2-amino-4-methyl-1-hydroxybenzene are diazotised and combined in a soda alkaline medium with 25 parts of 4-methyl- 1-hydroxynaphthalene-3-sulfonic acid. The soobtained azo dyestuif of the formula OH OH S 0 H wherein A-N=N represents the radical of a member selected from the group consisting of diazotised amines of the benzene and naphthalene series containing a lake-forming group in 76 o-position to the amino group and X represents 9 10 a member selected from the group consisting of 6. The complex chromium compound of an hydrogen and a radical of the benzene series. azo .dyestuff corresponding to the formula 2. The complex chromium compounds of an OH SOaH azo dyestuff corresponding to the general formula OzN -N=N- 0H SOsH AN=N H: g COOH H wherein A-N=N-- represents the radical of a member selected from the group consisting of The complex chrqmmm compound of an diazotised amines of the benzene and naphthaazo dyestufi correspondmg to the formula lene series containing a lake-forming group in. OH v OH 80311 o-position to the amino group and X represents I a radical of the benzene series. s N=N 3. The chromium complex compounds of an azo dyestuff corresponding to the general formula I OH son; H3

8. The complex chromium compound of an azo dyestuif corresponding to the formula 0H 0H 803B GM H:

N02 wherein A-N=N-- represents the radical of a member selected. from the group consisting of diazotised amines of the benzene and naphtha- ACHILLE CQNZETTI' lene series containing a lake-forming group in GUIDO SCHETTY o-position to the amino group.

4. The complex chromium compound of an REFERENCES CITED azo'dyestufi crre$pndmg to the formula 40 The following references are of record in the file of this patent:

f 0H 0H SOQH UNITED STATES PATENTS Number Name Date 303,335 Spiegel Aug. 12, 1884 CH, 863,290 Laska Aug. 13, 1907 2,034,390 Crossley Mar. 17, 1936 CH; 2,038,942 Kopp Apr. 28, 1936 2,090,938 Conrad Aug. 24, 1937 270 Moll Mar. 15 1938 5. The complex chromium compound of an 2,111: az d estufi corms 0 din to th form 1 2,181,051 Flelschhauer Nov. 21, 1939 y p n g e u a 2,268,936 Hasler Jan, 6, 1942 2,405,816 Conzetti Aug. 13, 1946 Number Country Date 636,356 Germany Oct. 7, 1936 OH 8,0311 2,418,416 Locke Apr. 1, 1947 N: 2,451,579 Schetty Oct. 19, 1948 FOREIGN PATENTS 

8. THE COMPLEX CHROMIUM COMPOUND OF AN AZO DYESTUFF CORRESPONDING TO THE FORMULA 